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Auxiliary Contact Blocks for UKC Contactor Control & Status
KRIPAL manufactures auxiliary contact blocks as direct snap-on accessories for the UKC contactor range, providing normally-open (NO) and normally-closed (NC) contacts for control circuit interlocking, PLC status feedback, and motor run indication. Available configurations include side-mount (AU-1 for 9A-85A, AU-100 for 100A-220A) providing 1NO+1NC, and top-mount versions (AU-2 and AU-4). The AU-2 series provides 2-pole configurations, while the AU-4 series offers high-density 4-pole arrangements ranging from 4NO to 4NC to suit various control requirements.
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AU-1 Auxiliary Contact Block 2 Contact 1NC + 1NO Side Mount
Contactor auxiliary contacts are functional accessories designed to work with the main contactor unit.
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AU-2 Auxiliary Contact Block 2 Contact 1NC + 1NO Front Mount
Auxiliary contact contactor block AU‑2, front‑mount design with 2 contacts (1 NC + 1 NO).
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AU-4 Auxiliary Contact Block 4 Contact 2NC + 2NO Front Mount
Magnetic contactor accessory: AU‑4 auxiliary contact block designed for motor starters and control circuits.
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AU-100 Auxiliary Contact Block 2 Contact 1NC + 1NO Side Mount
The “AU-100” delay auxiliary contact module is a side-mounted module used for delay and control signal switching.
Ask a QuoteAuxiliary Contact Block Selection Guide
Auxiliary contact blocks serve as secondary switching interfaces, providing real-time electrical status feedback of the main contactor. These devices integrate seamlessly with PLCs, status indicators, and safety interlock circuits within industrial motor control centers (MCCs).
Technical Configurations of the AU Series
AU-1/AU-100 Side Mount Architecture
Features a 1NO + 1NC contact configuration. Engineered for lateral attachment, these units accommodate standard industrial panel layouts that provide adequate horizontal clearance. The AU-1 is designed for the 9A–85A contactor range, while the AU-100 is dedicated to the 100A–220A range.
AU-2 Front Mount Design
Integrates a 2-pole contact configuration via frontal attachment. This design optimizes enclosure real estate for high-density control panels where lateral space is restricted.
AU-4 High-Density Module
Delivers a flexible 4-pole hardware configuration with various options, including 4NO, 2NO+2NC, 3NO+1NC, 1NO+3NC, or 4NC arrangements. Specifically built to process complex feedback signals and manage multi-stage safety interlock logic sequences.
Direct Snap-On Integration
Employs a precise mechanical coupling mechanism requiring zero supplementary mounting brackets. Facilitates rapid deployment across the entire UKC base contactor range.
Reversing Starter and Interlock Capability
Fully supports sequence logic and electrical interlocking configurations, establishing reliable operational states within mechanical reversing motor starter assemblies.
Note: Electrical interlocks must be connected to the NC contacts of both contactors. Do not install reversing contactors horizontally.
Auxiliary Contacts in Safety Loops and Status Feedback Circuits
KRIPAL AU auxiliary contact blocks support a wide range of control panel applications in industrial automation, providing essential motor status feedback and signal switching for control circuits.
MCC Drawer Status Indication
AU blocks deliver reliable contactor open/closed status signals to PLC digital inputs and panel-mounted indicator lamps within low-voltage MCC systems. These are widely utilized in applications such as HVAC, water treatment, and material handling for real-time motor status monitoring.
Forward/Reverse Starter Interlock Feedback
In reversing motor starter applications, AU blocks serve as critical components for sequence logic and electrical interlocking. They ensure reliable operational states and are essential for preventing simultaneous contactor operation in conveyor and hoist drive systems.
Control Circuit Integration
AU blocks are engineered for seamless integration with base UKC contactors, providing the flexible contact combinations (NO/NC) required to manage complex signaling and control logic sequences in industrial environments.
Simplify Your Panel Component Sourcing
- Comprehensive CAD Library: Download 2D and 3D CAD models, including EPLAN and standard CAD formats, featuring accurate mounting dimensions for seamless integration into your electrical design environments.
- Expert Technical Support: Request application-specific wiring diagrams and guidance for sequence logic and electrical interlocking configurations to ensure robust control circuit operation.
- Bundled OEM Supply: Source AU auxiliary blocks together with the UKC contactor range and compatible accessories (such as UT-F/UT-N delayed units) as a complete motor starter assembly from a single manufacturer.
Auxiliary Contact Manufacturing: Matched Tolerances, Single Source
KRIPAL AU auxiliary contact blocks are produced on the same factory floor as UKC contactors. This ensures that the mechanical coupling tolerances between the AU block and the contactor body are engineered as a unified system, providing superior integration compared to third-party accessories.
Co-Engineered Mechanical Interface
The snap-on coupling between the AU block and UKC contactor is engineered as a complete system. Actuator pin depth, spring tension, and latch retention are rigorously verified across the full 9A–220A contactor range—ensuring high mechanical compatibility.
Reliable Control Feedback
AU blocks are tested to ensure consistent performance within industrial control loops. Their design facilitates precise interaction with the main contactor, supporting reliable state transitions for PLC inputs and status monitoring.
Material Consistency
The silver alloy formulation used in AU block contacts maintains high performance standards, matching the quality of the UKC contactor range. Using KRIPAL components together ensures predictable signal circuit life and documented performance characteristics.
Consolidated Procurement
Order contactors, thermal overload relays, and auxiliary blocks as a single source. Streamline your supply chain with unified lead times and consistent quality standards across all control circuit components.
Panel Builder Inventory Support
KRIPAL maintains inventory for standard AU contact configurations (such as 1NO+1NC, 2NO+2NC, etc.) to align with your panel production schedules, ensuring your assembly team has the necessary components on time.
Technical Documentation Support
For panel builders and system integrators, KRIPAL provides detailed technical documentation, including mounting dimensions and wiring diagrams, to assist in control circuit design and system validation.
Customized Identification
We offer options for component identification, including part number marking to match your specific panel wiring schedules.
Direct Engineering Support
Panel designers can communicate directly with KRIPAL engineers for technical guidance on auxiliary contact configuration and control circuit integration, optimizing your design efficiency.
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